Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps
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Date
2022
Journal Title
Journal ISSN
Volume Title
Publisher
IOP Publishing
Abstract
The 21cm emission of neutral hydrogen is a potential probe of the matter distribution in the Universe after reionisation. Cosmological surveys of this line intensity will be
conducted in the coming years by the SKAO and HIRAX experiments, complementary to
upcoming galaxy surveys. We present the first forecasts of the cosmological constraints from
the combination of the 21cm power spectrum and bispectrum. Fisher forecasts are computed
for the constraining power of these surveys on cosmological parameters, the BAO distance
functions and the growth function. We also estimate the constraining power on dynamical dark
energy and modified gravity. Finally we investigate the constraints on the 21cm clustering
bias, up to second order. We take into account the effects on the 21cm correlators of the
telescope beam, instrumental noise and foreground avoidance, as well as the Alcock-Paczynski
effect and the effects of theoretical errors in the modelling of the correlators.
Description
Keywords
Astronomy, Physics, Cosmology, Power spectrum, Astrophysics
Citation
Karagiannis, D. et al. (2022). Cosmological constraints from the power spectrum and bispectrum of 21cm intensity maps. Journal of Cosmology and Astroparticle Physics, 003. 10.1088/1475-7516/2022/11/003